smtp.utilibill.co.uk has no NS records.
NS records for this zone are defined at utilibill.co.uk.
NS records for this zone are defined at utilibill.co.uk.
Question and response
Question
dig smtp.utilibill.co.uk. NS
Answer
The response has no answer records.
Authority
utilibill.co.uk. 300 SOA ns-cloud-e1.googledomains.com. cloud-dns-hostmaster.google.com. 15 21600 3600 259200 300
Additional
. 0 OPT ; payload 512, xrcode 0, version 0, flags 0